Fitting Method and Error Study for Tau Lifetime Measurement of L3 Experiment

Yang Changgen; Chen Hesheng; Jin Bingnian; Tang Xiaowei; M. Pohi

Chinese Physics C> 1994, Vol. 18> Issue(S3) : 243-250

Fitting Method and Error Study for Tau Lifetime Measurement of L3 Experiment

1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing;
2. ETH-Z, Institut fur Hochenergiephysik, 8093-Zurich, Switzerland

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Abstract：
The sign-flip probability of the impact parameter in the measurement of the tau lifetime is studied. The probability of the impact parameter with the negative value is introduced into the formula to fit the tau lifetime in the L3 experiment. The systematic errors of the drift velocity and grid time calibration on the lifetime are also studied by using the special designed L3 Time Expansion Chamber (TEC).
- impact parameter ,
- decay length ,
- lifetime ,
- calibration

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Yang Changgen, Chen Hesheng, Jin Bingnian, Tang Xiaowei and M. Pohi. Fitting Method and Error Study for Tau Lifetime Measurement of L3 Experiment[J]. Chinese Physics C, 1994, 18(S3): 243-250.

Yang Changgen, Chen Hesheng, Jin Bingnian, Tang Xiaowei and M. Pohi. Fitting Method and Error Study for Tau Lifetime Measurement of L3 Experiment[J]. Chinese Physics C, 1994, 18(S3): 243-250. shu

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Received: 1993-06-09

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Supported by the National Natural Science Foundation of China.

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Fitting Method and Error Study for Tau Lifetime Measurement of L3 Experiment

1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing;
2. ETH-Z, Institut fur Hochenergiephysik, 8093-Zurich, Switzerland

Received Date: 1993-06-09

Fund Project: Supported by the National Natural Science Foundation of China.

Abstract: The sign-flip probability of the impact parameter in the measurement of the tau lifetime is studied. The probability of the impact parameter with the negative value is introduced into the formula to fit the tau lifetime in the L3 experiment. The systematic errors of the drift velocity and grid time calibration on the lifetime are also studied by using the special designed L3 Time Expansion Chamber (TEC).